Robo advisors are meant to be simple and automated to keep costs low and allow your wealth to accumulate; in looking at the top four firms in the market the Wall Street Journal found that humans choose what goes into the portfolios; this begs the question whether investors are aware of this human intervention; the WSJ takes a closer look at how Vanguard Group's Vanguard Personal Advisor Services (PAS), Betterment, Wealthfront and Schwab Intelligent Portfolios allocate their clients money; while robo advisors are deemed a simple solution they might not be and investors should understand how their money is allocated. Source